This alert expired on 2 September 2026 at 20:00 UTC. It is kept here as a record.
It is the 7th strongest of the 19 detections recorded within 20 km of this point since 7 April 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued September 2 at 1:34PM MDT until September 2 at 2:00PM MDT by NWS Missoula MT
An estimated 34,190 people live within 50 km of this point.
Nearby, since 7 April 2026
- July 24, 2026 · score 34 · 10.3 km
- September 2, 2026 · score 40 · 20.9 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 86 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 86% |
| Coordinates | 46.0292, -112.5861 |
| Nearest City | Butte (5 km) |
| Population Exposed | 34.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T19:34:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a0dad6857ed5d4a06fad335dbc4ca824b19156ee.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Deer Lodge, MT; Granite, MT; Powell, MT; Silver Bow, MT; Beaverhead, MT; Jefferson, MT; Madison, MT |
| Headline | Severe Thunderstorm Warning issued September 2 at 1:34PM MDT until September 2 at 2:00PM MDT by NWS Missoula MT |
| Expires | 2026-09-02T14:00:00-06:00 |
| SenderName | NWS Missoula MT |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a0dad6857ed5d4a06fad335dbc4ca824b19156ee.001.1","noaa_urn:oid:2.49.0.1.840.0.4c4ef7c4f2353ecf803af510e2573637094c25c9.001.1"] |
| Spc ReportType | wind |
| Spc Speed | 58 |
| Spc Location | 4 NNW Opportunity |
| Spc County | Deer Lodge |
| Spc State | MT |
| Spc Comments | Anaconda Bowman Field Airport AWOS K3U3 reported southwest wind sustained at 40 mph with gusts to 58 mph. At 1331 it reported a sustained wind of 44 mph. So far there h (MSO) |
| MergedSources | [{"id":"spc_wind_46.15_-112.87_42","source":"spc","severity":"medium","severityValue":45,"timestamp":1788377340000,"latitude":46.15,"longitude":-112.87}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens near Butte?
Calamity.live data shows a weather event with CalamityScore 28/100, near Butte (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.